This RepStrap was an experiment: What is the minimum you need to bootstrap yourself a printer good enough to enhance, improve and update itself? I asked myself in 2013. At best it would be built with a cordless drill, but in the end I had to use a drill press form time to time. First thouhts were only to use (alienated) standard parts, wrought material etc., but mercifully eBay had enough more specific items for me. :-)
My first tentative steps included destroying and re-builiding the nozzle.
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Once print speeds were reasonable, the heated mirror in place and calibration as good as it got the tinkered parts were replaced with printed ones. Many came from the Delta-Pi, some were coded in OpenSCAD.
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This RepStrap was abandoned in 2015 beacause of problems with the printed joints. Meanwhile a Sumpod Aluminium V2 became available to me, which lead me to the conclusion that carthesian printers are just easier to live with every day.
There is a high chance that I will re-use the "RoStrap" parts in another design however. Steps will then be postet (in rough) at https://burningbecks.wordpress.com first.